Needle for sound-reproducing instruments.



E. A. ALLWOOD. NEEDLE FOR SOUND REPRODUGING INsT UME NTS.

APPLICATION FILED JAN. 30, 1909.

Patented Feb.21,1911.

FIGS. F 16.4%

5' IS a vertical section ERNEST ALFRED ALLWOOD OF ALCES'IER,

ENGLAND.

I NEEDLE FOR SOUND-REPRODUCIN INSTRUMENTS.

To all whom it may concern:

Be it known that I, ERNEST ALFRED ALL- wooo, a subject of the Kingdom of Great Britain,-resi'ding at Alcester, in the county of Warwick, England, have invented certain new and useful Improvements in Needles for Sound-Reproducing Instruments, of which the following is a specification.

The present invention has relation to needles for use with sound reproducing instruments, and comprises improvements whereby the sound reproduc' g and vibratory qualities are greatly enhanced;

In order that this invention may be clearly understood and more easily carried into practice, reference may be had to the appended explanatory sheet of drawings on which Figure 1 is a front elevational view of one form of the present invention. Fig. 2 shows a side view of the needle illustrated in Fig. 1. Fig. 3 illustrates a pointed needle previous to stamping. Fig. 4 shows a modified formof needle subsequent to stamping. Fig. of the needle shown in Fig. 4'. Figs. 6, 7 and 8 are further modi fications of the improved needle.

In carrying the present improvements into efiect, the needle is preferably formed rom a pointed length of metallic wire A, such wire having'one or more raised ridges or rims a for'med by ressin or'stamping upon one side ofa fiiittene enlargement asshown by Figs. 5 and 7, or upon .bothsides Specification oi Letters Patent. Application filed January 30, 1909. Serial No.

Patented Feb. 21, 1911. 475,244.

the interior of or between the ridges a is subsequently removed as at a Fig. 1 or in cases in which increased rigidity is required, may be retained in the form of a thin diaphragm a while a fin or feather a is formed upon the exterior of the rims a.

The needle may provided with secondary ridges a across the face in order to supplement the main ridges a while one ridge or rim may be formed upon one or each side, or multi-ridges as shown in Figs. 7 and 8 may be used;

Having now described my invention, I declare. that what Iclaim is '1. A needle for use with sound reproducing instruments having a flattened enlargement with a raised rim or rims thereon, and a fin 0r feather exterior 2. A needle for use with sound reproducing instruments having a flattened enlargemerit, a centrally depressed diaphragm with. a surrounding rim,: and a fin to said rim substantially as and for the purpose herein set fortlr.

In witness whereof my hand in the I have hereunto set presence of two witnesses. ERNEST ALFRED ALLWOOD; Witnesses:.

WALTER H. E. BARTLAl I,

HORACE H. SMITH.

edge to the said .rim or rims substantially as and for the .purpose herein set forth. 

